Operation Efficiency And Optimal Control Of Renmin Dajie-Ziyou Dalu Intersection In Changchun City

In this paper, taking Changchun City People's street and free road intersection as an example, the vehicle as the research object, the analysis of the operation efficiency of the vehicle under the long cycle control program. The dissipation process of the vehicle passing through the intersection is introduced in detail, analyzed the long queue caused by the long cycle of spread type signalized intersections affected the running state of the vehicle. Using artificial counting method and imaging method combined with the acquisition of intersection upstream sections of the vehicle arrival rate, the release of intersection traffic volume and vehicle queue length data.Taking north approach of People's street and free road intersection as an example, vehicle first discharge headway is analyzed using video capture. The vehicle first discharge headway of left turn lane is the largest and the vehicle first discharge headway of inside straight lane is the smallest. Analyzing the factors that influence on first discharge headway, the lane type and lane position are the main factors that influence the first discharge headway. And the use of statistical methods for different types of Lane first discharge headway distribution fitting results show exclusive left turn lane and outermost straight lane the first discharge headway with normal distribution well fitting, fitting inside of the straight lane the first discharge headway with lognormal distribution is obtained good. In order to analyze the variation of the headway of queuing vehicle release process, the average queue length and the saturation headway of each lane are statistically analyzed by using the method of video data and artificial counting. Detailed analysis of the follow-up to the vehicle headway changes with the line shift the position, by comparing the peak hour data and rush hour data, the general variation law of vehicle headway under long period signal timing scheme is obtained and analyzing its influencing factors. First discharge headway and saturation headway, and rush peak hour rate were obtained by survey. Combined with the calculation method of the capacity of city road design specifications, capacity of the intersection of the road and saturation were calculated. The calculation of the approach saturation was above 0.78, the service level is low, so consider this intersection optimization.The signal optimization of the intersection can effectively improve the operating efficiency of the intersection, the average vehicle delay, the vehicle queue length is the main index of the operational efficiency of the cross port. In this paper, a statistical analysis based on the front of eccentricity signal optimization method and Webster with methods of intersection flat peak and peak signal, using the VISSIM simulation of intersection operation was simulated, and the average vehicle delay, maximum queue length, average queue length of the three indicators were used to analyze and compare before optimization and after optimization of intersection operation efficiency, flat peak front distance analysis program evaluation index upgrade rate for 19.71%. Webster scheme evaluation index upgrade rate reached 17.71%, the peak index upgrade rate reach 6.86%.Above all, the thesis research, finally in this paper, the research work on the concrete analysis and thinking, and further optimize the space, and made a reasonable design for future work, improve the deficiency in this article.